Graduate Thesis Or Dissertation
 

Potential of Trichoderma sp. for inhibition of Botrytis cinerea and Sclerotinia sclerotiorum on snap beans

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jm214r22d

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  • Isolates of Trichoderma spp. collected from snap bean foliage were tested for inhibition of grey mold of snap beans caused by Botrytis cinerea. In a detached blossom-pod assay an isolate of Trichoderma hamatum reduced pod rot by 94% compared to the nontreated check. Control was comparable to that obtained with the fungicide vinclozolin. As few as 42 colony forming units (CFU) of T. hamatum per blossom reduced pod rot by 77% compared to the nontreated check. Control was 97% when 233 CFU per blossom were applied. Grey mold was reduced only when spores of T. hamatum were applied to blossoms prior to, or at the same time as, conidia of B. cinerea. In field studies conditions were very warm and dry. Because B. cinerea is primarily a cool weather pathogen, grey mold incidence was too low to detect meaningful differences among treatments. Differences in the incidence of pod rot caused by Sclerotinia sclerotiorum, however, were observed among treatments in these field trials. Control of white mold by T. hamatum was comparable to that obtained with the fungicide vinclozolin. Populations of Trichoderma spp. on foliage rapidly decreased following application of a T. hamatum spore suspension but remained higher in treated plots than in nontreated plots up to two weeks following application. The isolate of T. hamatum used in these trials produces volatile compounds which in vitro inhibits the growth of B. cinerea and S. sclerotiorum. Mean radial growth of B. cinerea in a closed chamber with a T. hamatum colony was 0.6 mm compared to 23.6 mm when enclosed with noninoculated potato dextrose agar (PDA). Mean radial growth of S. sclerotiorum was 0.8 mm when enclosed with a T. hamatum colony compared to 32.3 mm when enclosed with noninoculated PDA.
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